Lapsed Jul 8, 2015 on the fee record · High confidence
20-year base term ended Oct 15, 2019
Third maintenance fee unpaid; grace period ended.
Held by Memjet Technology Limited
Filed Apr 16, 2001 as application 09/835,457 · Granted Jul 8, 2003
Base term, 20 years from filing, plus 26 days of patent term adjustment (USPTO delay)
Today
Lapsed Jul 8, 2015
1999
2026
Clock starts
Oct 15, 1999
Oct 15, 1999
No longer in force
Jul 8, 2015
Jul 8, 2015
Granted
Jul 8, 2003
Jul 8, 2003
Term would have run to
Nov 10, 2019
Nov 10, 2019
base term
patent term adjustment
after the term ends
fee events
Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
26
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
1,425
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Nov 10, 2019: its 20-year base term plus 26 days of term adjustment for prosecution delay. Confidence: High. from the record
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Oct 15, 1999, when application PCT/AU1999/000894, the earliest non-provisional in its chain, was filed (this one was filed Apr 16, 2001) | Oct 15, 2019 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +26 days, USPTO patent term adjustment record | Nov 10, 2019 | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | lapsed Jul 8, 2015 | High confidence |
| Computed term end | The steps above, in order | Jul 8, 2015 | High confidence |
This family
| US 6,464,340 | Term ended Aug 2018 | Aug 2018 |
| US 6,918,655 | Lapsed on the fee record Jul 2017 | Jul 2017 |
| US 6,938,989 | Lapsed on the fee record Sep 2013 | Sep 2013 |
| US 6,742,873 | Lapsed on the fee record Jun 2016 | Jun 2016 |
| US 6,923,526 | Lapsed on the fee record Aug 2017 | Aug 2017 |
| US 6,588,882 | this patent Jul 2015 | Jul 2015 |
| US 6,505,912 | Term ended no later than Jul 2018 | no later than Jul 2018 |
| US 6,485,123 | Lapsed on the fee record Nov 2014 | Nov 2014 |
8 of 1425 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.
Assignments
Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Sep 10, 2001 Reel 12151, frame 777 | Silverbrook, Kia | Silverbrook Research Pty Ltd. | Assignment of Assignor's Interest |
| Jul 12, 2012 Reel 28538, frame 24 | Silverbrook Research Pty. Limited and Clamate Pty Limited | Zamtec Limited | Assignment of Assignor's Interest |
| Jun 25, 2014 Reel 33244, frame 276 | Zamtec Limited | Memjet Technology Limited | Change of Name |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup
Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Note
The 26 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
45
later US patents cite this one
That is top 25% of utility patents granted in 2003 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.